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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48c5da77a381f573a3bc2382656ae6b76a8969f23bcb1bbf2a1e3ee9ad3b5e7' 
  AND token = 'cZSK4SWAOuLqu9BUxuMFDe62see8p7vIAYuGi9LIsvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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