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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675dbb9dbe62ce29599e6f3662283226891deb06f505301ec9a5aabe0b8ffcad' 
  AND token = 'XRft1u7tIwAx+UT2IOg/d53UNXygRT++sd3UTRGogvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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