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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e272196785ffe3c6f9ea19aa6a9882bc435e41e327f9b328f232ec5200642b' 
  AND token = 'Ynn9ByLoH6oPcg9tXmB+dHFQ92GjMUp69uH87/9RACs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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