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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb31d3f8ee50f040d5ce67cdc6ec2b3f879e8680e47dd42be00a8f7e2e3159fa' 
  AND token = 'UX9mkGqmKU6IiZhmfmGjEgrdc8GFnv2KAruPWvKD5ng=' 
  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"
    }
  }
}