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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff94d179b1f54d69125ba3008a62c0ee82987ca61b04f29e14040aec65bbe30' 
  AND token = '3F0fxzzuaUX5Xk3aq+RH3Kn7TS31G1UkU6XWpddonJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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