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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e573b0ce1b39eb9b4d1858c1410c61e486198cd837596f43f52bd1a94cd3071' 
  AND token = 'p8GfHlmwHdzpG74K0nKyawjEfxmp4vMJFs6idJQr2gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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