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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87c7519241fd9b680cd6184be35b1178c4ac699fe4b5e0475e34ffa7bc287fd' 
  AND token = 'bVzcwxl3wVbmds8yDakLu6D/gIGIvd+069N4gwXbdHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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