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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0144b300dac0850a4e1365e27b747979abba119e3a4d8f5a0b195c0a90afde62' 
  AND token = '1NT4sFr62lAImJ/pgfQX4iyB0kB8Jlrd40ZUnsQW6N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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