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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54822f24920b67ae53b6a1b19eff7e8c3ff3d363a5141f7d2a1d61976e0e7f27' 
  AND token = 'bkFq7dtDLcnsrNYEaGuGkD+JLed7Y/Gl/4uv8N3oE84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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