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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c99d5736a1beea020fd4ac13ee7b668fdd99227c37e205c57a20c106a0ba02' 
  AND token = '8g1Y3/qCtj62JFYT6ZtnWxpcfLdornVuhldY/kBQPe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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