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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2834a63a7e5c4d74be206494849e4f9c2ed6ff5dfc0f9f13f75de8142df129b' 
  AND token = 'zzSQ31BOWUpVmRP5chZ+d2B0n4f8+2N4ktdq8XAwyCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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