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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c8c6d42b4fffa9edcad8d01156eb47b42edd58fe44763ad5f558fa6dd561a6' 
  AND token = 'uIVzJFkUH5KrApKIYcGupnkHWnHs2pk/6Y+v96EABok=' 
  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"
    }
  }
}