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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017c1efde9809a3be77e16e643cc20d52013b52a216497bc79d0fec6f3ec59d4' 
  AND token = '0cv+CbTBurCo85QAQYvhYG6i3lcf8yVTpvt1iVYd68g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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