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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b20d0e3cf07892f5478245781a84a2c09dfe503a1d820352b1ecaf9810773e' 
  AND token = '41pcE83BrSA+//IpKPkpB2N/66q3l5TvnqWMGtWcFmY=' 
  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"
    }
  }
}