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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5868b9dff590bcd4aa7a628728a8aab70be79923948d40d1faffe8c5fabc22db' 
  AND token = 'TzFNr1hx/jbrjaXyg20nYZaInM63XqC1isGmuW8DOew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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