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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babae85c741179d9a3849a66b5992aa63cda8f0095443652332f07e79ac8dfd4' 
  AND token = 'ZUNLETvyi7edtzbuAXU/q0JbuE3DgOJf+ek9YMbRbqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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