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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86524e217fa26291fca411b6b17fa8f3c8c88edd2681e498cf47ab8060e0362e' 
  AND token = 'SoMV4uvQvJS5JT3rz07cBwYJZdcK65pymY+YfILQJSU=' 
  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"
    }
  }
}