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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f43d99ad245e8f368896739beccc3184a94e815aeda1c3d352ce09b8477869' 
  AND token = 'k7w5fd+HlpS0kFAP1Id+D81BG8i+JoYjklu0XPU1LVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}