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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a079d642879541b0dc6a0b55996c9e7776ea98859c5916d70fdb9d0d05007970' 
  AND token = 'D+OafFq4+g6FjqaXTkfSnPxeKiAHs99WtOacDtr0s10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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