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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb288121db38f757de9ae5d8d2779d88ade0e0cb9d24978ffb53faf5259c9b0' 
  AND token = 'oFIPkmw0fzQ7HChfk4lN7r/pWFfKxlf+GC16yafzkus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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