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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f7b0dbdae2e8edbc1b13214f95025d8e9758051e5aac158d41059e840277b1' 
  AND token = 'xIvf/mEibqANjI5dbv2Y6gaqSUQ2EIDjhPKqEuz5LCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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