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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97b5d5a2eef304ec1d4943e5dfff9faa07dc234fe741306addc9ee8fa40c4e7' 
  AND token = 'Exy41k/dD624a/4auHNX1LkdTLbhjU0T3fw/I10/UYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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