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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2746533871f452457ae87612f21a5519666a27f7c0a58b9f4a61bc2677f08558' 
  AND token = '9dPq+kYHeQMIWY6qriWfQwWU+9ghRGTF6RhRmm8SVbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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