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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be290c700c825a6b1d430aba7c713631c76437ddd2256f3a8892aed88a3ece90' 
  AND token = 'AISH3OZKCjMP8cEcBjbC5f9wppCLLFPEDLLZ1kC6NGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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