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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbca2d87e3a2ed556766f5a7446e2763f8b7ac28534a488eac10c4bfc2d340ad' 
  AND token = '2WNUAwa4zrUFUEAy9rJcrjRPOjVizhb5tnnV3BrwDiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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