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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098287014f3eb80238c18b7f70ed3466af9ab3279a454e8cd94539ed6e101b09' 
  AND token = 'pHVj2r+4LWeZLCH+nLFaD3blcrkWJI/Z3o+moc5pB/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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