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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9771200447d3d95458d6476fdfa5cb47ce0362a25a1de478a33249be09851ba' 
  AND token = 'sagqeFiikWjtWmBHkgYFCWqLy4bHSXGjP1de9N1Z8qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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