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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d50320761e4c650d57f994af582e77ff8ddf7611679203e39a088461cb4adca' 
  AND token = 'Lj2RDi7/sKqfAldAaj0dttd7rpps7sJf9AvgKQOYlQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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