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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364a0ea91679d923b8f1c576b691897bc199c6e8cb3ed7dcc0916c998a65cdc6' 
  AND token = 'tgDwd607ZexU1xCUWfnuOZwO2/aMhVHvRa9kEsRAC6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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