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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9038feb16a4ad05c53fe7c7fa4d4d8d3dc4dcf39b327ec462df0f8b03749904' 
  AND token = 'qEr/oJP5XXv5aNpbVmckJ3GHzYKeVVokD31bN2z+uqI=' 
  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"
    }
  }
}