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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104b9bf8a8e8c7704714f791214791c5a45632d5357ff72a34dbea1a692938a5' 
  AND token = '0Nv5e16iG/XKykzyHmVAASIN5S9UXS7FTWS4fTNLi4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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