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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7939218b0b1e9de1b5e4dfe8c8c23a4164b1dc12582539f7f773f95de100677e' 
  AND token = 'BKnYSCURGpb1/TchKo0NJy6YwdjDtQnjdG5ftdpnnzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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