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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e818f2dd43f1c22441a8a44aa4ac20ce0ac274d03cee4c8aa004f919c1d94ff' 
  AND token = 'v+6KM8cHws0d0g2Cbs+Ze0lb7aVcrn07Ru55BavjX6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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