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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9b9de82170e330c1404ea9a3a0da63998d1e099a9884afe439eb2be67b65d9' 
  AND token = 'mG4Yiew4rZD4LymEdTybubeFJ+Aj6Z/EgG3CC5fWIC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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