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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce99d445322f10e8257e028688bf68b8c755a61eb3a4c603a0a7cdd710a663b' 
  AND token = '/kF96g58jJKBQN+AtWSJLVyy2a9zHkg7JBk1dBFRiZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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