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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2fcf099ebb6d4d18110a9c9058e0fec70c89347c2fa4d3f998155e9be6d167' 
  AND token = 'AC9jJLAb/eHbLxyfybmtd+dmNEO3ZvQfdBMKjWrGg+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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