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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5253faea3b84ac9a90d33c32656bcd83875d3befacbe4fcc436693d5221e52' 
  AND token = 'jVUIVYcc3PO83Kw3+80MJc//S004EHK0A4rVRYTwWxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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