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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b7c32e4965edd8abc8204dff0f7cd64c6e810ef64cdd1c05f05a4ba069ab24' 
  AND token = 'srILxPEMfbcZgg5mD6pI6xEXYRXO9OZJdjDGb1R8r/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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