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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8592f95eec54c24c4af3f43b19cf88b6dccb5e7356ac83c869dfb3b3a2b8a6' 
  AND token = 'aAFHb+n1fbM9Er5DiohDFDlTKXh88Op3/m9nMIFa/zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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