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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fc00ab39b08d0086370d9a88c9f7fddfb2ffcbb5b0ac9d5e42a3868114084e' 
  AND token = '77H8/EVuo/PbF11d7Yc5+PSIu5sanIc084Y1zfIzR4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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