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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc77a903aaed5f838d97f78f929e8d284ca485196d0c72c59defaa276a2acc5e' 
  AND token = 'HiX9wtV/2O/NkY6sTOUUywNxYV7SqImH8Kyah7AKjBs=' 
  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"
    }
  }
}