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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b541bfa9293c7cff8cba111d1a37257d7a06a8c0db6744443c62c478947320' 
  AND token = 'DEyPXtJBT3OLRWhn/PZAHsKWN3bpP/ArL+FpQ3rutFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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