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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ac79db6576753cfec2df3174605bbe12cacc23666b060b4bd08d185d54db40' 
  AND token = 'bIX59+gIn8ccFYz+JjqWTIE/QhAhz+fCjQbNbkPnGkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00281

JSON explain

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