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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd74dd4441d9a8844a5d8c7b6faccee4338495a77374d0a673fff5f2fe8f1b4' 
  AND token = 'NjWRrjFwICOOLpKG+8LylZl9Gn4e9NWAl3t+7rcVSBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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