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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23f0c6885ef02cbb0d433f452f5a018d64e25bcd503de1136cb44848ce58a6b' 
  AND token = '+KbQsgWRT/HQFc5M2RnHq1pPvbSXUnH5+TNqnAMufqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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