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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea6042715e48afab6677c662aa225cc263a61600c99682c7f8d66f5f9aa83ae' 
  AND token = 'pXhc7gry7octts3L7IHF/fsPRGIv3+NB9DgXYulv0xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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